Convert Millimeters of Water to kgf/mm²
1 millimeter of water (mmH₂O) = 0.000001 kilograms-force per square millimetre (kgf/mm²). 1 kgf/mm² = 1000000 mmH₂O. Example: 15 mmH₂O = 15 × 0.000001 = 0.000015 kgf/mm².
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1 mmH₂O = 0.000001 kgf/mm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter of water to kilogram-force per square millimetre converter to paste a column from Excel.
How to Convert Millimeter of Water to Kilogram-force per Square Millimetre
- 1 mmH₂O = 0.000001 kgf/mm²
- 1 kgf/mm² = 1000000 mmH₂O
- Example: convert 15 mmH₂O to kgf/mm²: 15 mmH₂O = 15 × 0.000001 kgf/mm² = 0.000015 kgf/mm²
Reference conditions. mmH₂O: Conventional water column: ρ = 1000 kg/m³ and gₙ = 9.80665 m/s² (≈ water at 4 °C).
Formula
kgf/mm² = mmH₂O ÷ 1000000
Derivation from SI units:
- 1 mmH₂O = 1000 kg/m³ × 9.80665 m/s² × 0.001 m = 9.80665 Pa
- 1 kgf/mm² = 9.80665 N ÷ 1 mm² = 9.80665 MPa (exact)
- 1 mmH₂O = 9.80665 Pa ÷ 9806650 Pa per kgf/mm² = 0.000001 kgf/mm²
Both units are defined exactly, so the factor is exact. Millimeter of Water definition: millimeter of water; Kilogram-force per Square Millimetre definition: kilogram-force per square millimetre.
Worked examples
- A reading of 25 mmH₂O converts to 0.000025 kgf/mm².
25 mmH₂O × 0.000001 = 0.000025 kgf/mm² - A value of 250 mmH₂O is 0.00025 kgf/mm².
250 mmH₂O × 0.000001 = 0.00025 kgf/mm²
Millimeter of Water to Kilogram-force per Square Millimetre conversion table
| Millimeters of Water (mmH₂O) | Kilograms-force per Square Millimetre (kgf/mm²) |
|---|---|
| 1 mmH₂O | 0.000001 kgf/mm² |
| 2 mmH₂O | 0.000002 kgf/mm² |
| 5 mmH₂O | 0.000005 kgf/mm² |
| 10 mmH₂O | 0.00001 kgf/mm² |
| 15 mmH₂O | 0.000015 kgf/mm² |
| 20 mmH₂O | 0.00002 kgf/mm² |
| 25 mmH₂O | 0.000025 kgf/mm² |
| 30 mmH₂O | 0.00003 kgf/mm² |
| 50 mmH₂O | 0.00005 kgf/mm² |
| 75 mmH₂O | 0.000075 kgf/mm² |
| 100 mmH₂O | 0.0001 kgf/mm² |
| 150 mmH₂O | 0.00015 kgf/mm² |
| 200 mmH₂O | 0.0002 kgf/mm² |
| 250 mmH₂O | 0.00025 kgf/mm² |
| 300 mmH₂O | 0.0003 kgf/mm² |
| 500 mmH₂O | 0.0005 kgf/mm² |
| 1000 mmH₂O | 0.001 kgf/mm² |
| 2000 mmH₂O | 0.002 kgf/mm² |
| 5000 mmH₂O | 0.005 kgf/mm² |
| 10000 mmH₂O | 0.01 kgf/mm² |
Where it's used
Millimeters of Water are used for fan static pressure and duct design in Asia and Europe, while kilograms-force per square millimetre appear in tensile strength in older JIS and GB steel standards. Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Millimeter of Water to other pressure units
| Conversion | 1 mmH₂O equals |
|---|---|
| millimeter of water to kilogram-force per square millimetre | 0.000001 kgf/mm² |
| millimeter of water to pascal | 9.80665 Pa |
| millimeter of water to kilopascal | 0.00980665 kPa |
| millimeter of water to ksi | 0.000001422334331 ksi |
| millimeter of water to kilogram-force per square centimetre | 0.0001 kgf/cm² |
| millimeter of water to psi | 0.001422334331 psi |
| millimeter of water to bar | 0.0000980665 bar |
| millimeter of water to millimeter of mercury | 0.07355591353 mmHg |
Show 12 more units
| millimeter of water to inch of water | 0.03937007874 inH₂O |
|---|---|
| millimeter of water to atmosphere | 0.00009678411054 atm |
| millimeter of water to megapascal | 0.00000980665 MPa |
| millimeter of water to gigapascal | 9.80665 × 10⁻⁹ GPa |
| millimeter of water to newton per square millimetre | 0.00000980665 N/mm² |
| millimeter of water to millibar | 0.0980665 mbar |
| millimeter of water to torr | 0.07355592401 Torr |
| millimeter of water to centimeter of water | 0.1 cmH₂O |
| millimeter of water to inch of mercury | 0.002895902107 inHg |
| millimeter of water to decibar | 0.000980665 dbar |
| millimeter of water to inch of water (60 °F) | 0.03940945989 inH₂O (60 °F) |
| millimeter of water to barye | 98.0665 Ba |
Frequently asked questions
How many kilograms-force per square millimetre are in 1 millimeter of water?
1 mmH₂O = 0.000001 kgf/mm².
How do I convert millimeters of water to kilograms-force per square millimetre?
Multiply the value in mmH₂O by 0.000001, or divide it by 1000000. For example, 15 mmH₂O × 0.000001 = 0.000015 kgf/mm².
Is the mmH₂O to kgf/mm² conversion exact?
Yes. Both units are defined exactly, and 1 mmH₂O is exactly 0.000001 kgf/mm².
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "millimeter of water, conventional (mmH2O)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kilogram-force per square millimeter".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Millimeters of Water to kgf/mm². Retrieved October 25, 2026, from https://scientificconverters.com/pressure/millimeter-of-water-to-kilogram-force-per-square-millimeter/
IEEE
Scientific Converters, "Convert Millimeters of Water to kgf/mm²," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/pressure/millimeter-of-water-to-kilogram-force-per-square-millimeter/